All of the workouts in the P90X program are intended to get you in shape, but not all of them are intended to help you bulk up. Cardio routines Kenpo X and Plyometrics give you an aerobic workout, while Yoga X develops long, lean muscles. But if it's bulk you're after, focus on strength training workouts.

Chest and Back

The P90X Chest and Back workout is heavy on the pull-ups and push-ups. Beyond standard pull-ups and push-ups, you can expect to do more intense versions, for example, decline push-ups performed with your feet raised. The routine also has a number of back exercises that will require heavy weights or resistance bands. These include heavy pants and lawnmowers, both of which work your back muscles.

Shoulders and Arms

The Shoulders and Arms routine works your shoulder muscles and your upper arms, more specifically your triceps and biceps. Various arm curls work the biceps, while kickbacks strengthen the triceps and upright rows and presses strengthen the shoulders. Most of the exercises in this routine will require use of weights or resistance bands but some, such as side tri-rises and chair dips, rely on your own body weight.

Legs and Back

The Legs and Back workout will help you bulk up your lower body and back. For your lower half, you'll do plenty of lunges and squats. Using weights is optional for these exercises, but keep in mind you'll need to use the heaviest weight you can manage if your goal is to bulk up. For your back, you will do pull-ups with different grips, including wide front, closed grip overhanded and switch grip, for which you alternate between overhanded and underhanded pull-ups.

Chest, Shoulders and Triceps

For the Chest, Shoulders and Triceps workout, you'll work out your chest with push-ups while strengthening your shoulders with pike presses, shoulder presses, shoulder flies and other exercises. As for the triceps, you'll build them with a variety of exercises including side tr-rises, chair dips and triceps extensions.

Back and Biceps

The Back and Biceps routine works your back out in general, but focuses specifically on the biceps. For your back, you'll do a variety of pull-ups and some exercises with weights or bands, such as lawnmowers and bent over rows. With weights or bands, you'll workout your biceps with a variety of curls, including one-arm concentration curls, static arm curls and one-arm corkscrew curls.